Centrifugal fan.



J. E. GRAMLICH.

CENTRIFUGAL FAN.

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1,169,476. Patented Jan. 25, 1916.

WITNESSES.-

M! VENZ 0?.

A TTORNEYS.

UNITED STATES PATENT OFFICE.

JACOB E. GBAMLICH, OF SYRACUSE, NEW YORK, ASSIGNOB TO CHASE -MOTOR TRUCK 00., OF SYRACUSE, NEW YORK, A COBPOBATlION 01: NEW YORK.

CENTBIE'UGAL FAN.

Specification of Letters Patent.

Patented Jan. 25, 1916.

T all whom it 122 ay concern:

Be it known that I, JACOB E. Gunmen, a citizen of the United States, and a resident of Syracuse, in the count" of Onondaga and State of New York, have invented a certain new and useful Centrifugal Fan, of which the following is a specification.

This invention has for its object the production of a centrifugal fan particularly applicable for use as a fly wheel for air cooled engines for drawing air through the hood and boot surrounding the'engine; and the invention consists of the novel features of construction hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings, in

which like characters designate corresponding arts in all the views.

Figure 1 is a face new, partly broken away, of this fan. Fig. 2 is a cross-sectional 3 between the headsthe front head 1 at l the receiving end of the fan having' an enlarged inlet opemng 4 so that the front head is practically a flat ring at the margin of the fan, and the rear head 2 being solid and closin the rear end of the fan and being integral with the hub 5 of the fan. The central portion or zone ofthe rearhead 2 inclines forwardly as it approaches the hub, toward the front orreceivinz side of the fan and forms a cone 6.

The vanes 3 are formed integral with the heads 1, 2 and extend inwardlv terminating near the center or hub of the fan and incllne in a lengthwise direction so that the portions thereof exposed through the receiving opening 4 have a lead as they approach their inner ends; in other words, the vanes extend in tangential directions relatively to the axis of the fan, that is, they in- .a cline mwardly in the direction of rotation of the. fan, the fan rotating in the direction of the arrow, Fig. 1. The portions of the vanes behind the front head I extend in subaantially radial directions.

The front edges of the portions of the vanes exposed through the opening 4 are cut inwardly along concave lines as 7 extending from the inner edge of the front head 1 and extending toward the inner ends ii of the vanes and terminating near the front head 2 or cone 6 thereof and near the hub 5. The vanes are thicker at their outer ends, that is, their portions lying behind the front head 1 are thickened and formed with concave faces 8 on the advance sides of the vanes which form continuations of the front faces of the tangential or inclined portions of the vanes. The rear sides of the thickened ends of the vanes are convex, as at- 9, and form continuations of the rear faces of the inclined portions of the vanes, but the curvature thereof is less than the curvature of the advance sides of the vanes. The thickened ends of the vanes increase gradually in thickness as they approach the rear head '2, the increased thickness lving on the rear sides of the vanes. This increased thickness of the vanes is due to tapering the vanes of the pattern so that the pattern can be readily withdrawn out of the molding sand. Owing to this arrangement of the vanes and the shape of the outer ends of the; vanes, 11 particularly powerful and efficient fan is produced, that is, the vanes, owing to their incline, take the air and move it outwardly to the radially extending concave faces which cause the air to be hurled away from the fan.

This fan is particularly designed to be used as a fly wheel for internal combustion engines, and in operation owing to the formation of the vanes and the cone, moves the air outwardly with accelerated motion through the gradually widening spaces between the vanes to the concave faces at the ends of the vanes which hurl the air away from the fan Whit I claim isl:f bod 1. f oentrlfuga' an com rising a v including front and rear h ads, the front head at the receiving end of the fan having an opening, the rear head closing the rear end of the fan, and vanes between the heads of the fan, the portions of the vanes exposed through the receiving opening inclining and having a. lead in a forward direction as they approach the axis of the fan, and the portions of the vanes behind the front head extending'in radial directions, substantially as and for the purpose set forth.

2. A centrifugal fan comprising a body including front and rear heads, the front head at the receiving end of the fan having an opening, and the rear head closing the rear side of the fan, and vanes between the heads of the fan, the vanes extending in a tangential direction relatively to the axis of the fan and terminating at their inner ends near the center of the fan, the portions of 5 the vanes exposed through the receiving opening having their inner portions cut away along lines extending from the inner margin of the front head at the receiving end of the fan and extending toward the rear head of the fan and inwardly to the inner ends of the vanes, the outer end portions of the vanes lying directly behind the front head, extending in radial directions, substantially as and for the purpose described.

3. A centrifugal fan comprising a body including front and rear heads, the front head at the receiving end of the fan having an opening, and the rear head closing the rear end of the fan, and vanes between the heads of the fan, the vanes extending in tangential directions relatively to the axis of the fan and terminating at their ends near the center of the fan, the wines-being thickened at their outer ends, and the front faces of the thickened outer ends being concave the rear sides of the vanes at their outer ends being convex, substantially as and for the purpose described 4. A centrifugal fan comprising a-body including front and rear heads, the front head at the reeeivingend of the fan having an opening,the rear-head closing the endof the fan,- and vanes between the heads of the fan, the portiors of the vanes-exposed through the rccei ing and having'a lead inn orward direction as they approach the axis of'the fan, and'the portionsof the vanes between the front end 40- being thickened and extending in radial directions, sibsta'ntially as and=for the pura. A- centnfugal fan comprising inclu head at an opening; the rear heed closingdhe rear eidlpffthe and vamsf behzween the heads 0 t e an, epcrtionso 't' vanesexposed thronghthereceivingopeningine and having a lead in a forward direction as they approach the axis of the fan", and the portions-of'the vanes behind the fizonthead'being fliickened'and extending in radial directions, and thefront facesof opening inclin a body front and rear-heads, the'front' receiving end of-th'e face end of the fan and vanes between the heads of the fan, the portions of the vanes exposed through the receiving opening inclining and having a lead in a forward direction as they approach the axis of the fan. and the portions of the vanes behind the front head being thickened and extending in radial directions, and the front faces of the thickened portions being concave and forming continuations of the front faces of the inclined leading portions of the vanes, and their rear faces being convex, substantially as and for the purpose described.

7. A: centrifugal fen comprising a body including front and rear heads, the front head at the receiving end of the fan having an opening, the rear head closing the rear end of the fan, and the central portion or zone thereof inclining forwardly as it approaches the axis of the fan forming a cone. and vanes between the heads, the portions of the vanes exposed through the receiving opening and lying on the cone having a lead in a forward direction as they approach the axis of the fan, said portions of the vanes exposed through the receiving opening having their forward edges located in lines extending from the inner edge of the front head of the fan and terminating near the inner ends of the vanes near the rear head, and the outer ends of the vanes being thickened, and "the thickened ends being formed with concave front faces and convex rear faces forming continuations of the front andrear faces of the vanes, substantially as and for the purpose In testimony whereof, I have hereunto signed my name inthe presence of two attesting witnesses, at Syracuse, in the county of Onondaga, in the State of New York, this 9th day of Man, 1914.

JACOB E. GRAMLICH. ffin '02:, C. Dorm.

c m-at tik-petat-Iagn'bs amen arrive-cent: each,- by the com-ot'r'atcuts,

Washington, 111 0;

It is hereby certified that in Letters Patent No. 1,169,476, granted January 25, 1916, upon the application of Jacob E. Gramlich, of Syracuse, New York, for an improvement in Centrifugal F ans," an error appears in the printed specification requiring correction as follows: Page 2, line 39, claim 4, for the word between read behind; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 24th day of April, A. D., 1917.

F. W. H. CLAY,

Acting Commissioner of Patems.

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